This problem can occur when an album in Heliums library contains a reference to a file that has been moved, renamed or deleted.
If you have imported a database from Helium 11 for example or moved a database between machines it may result in invalid picture links.
You can solve this by:
- Updating pictures manually or with the download picture tool
- Updating references in tblAlbums.AlbumPicturePath manually in the database to point to valid paths
- Use the script "Update album pictures from files" to automatically locate and add album pictures from albums folders and a specific folder